<div class="row">
  <div class="col-md-6 mx-auto">
    <div class="card card-body">
      <img class="logo" src="/img/logo.png">
      <h3 class="text-center">登录</h3>
      <form action="/users/login" method="POST">
        <div class="form-group">
          <label for="email">邮箱</label>
          <input type="email" name="email" class="form-control" required>
        </div>
        <div class="form-group">
          <label for="password">密码</label>
          <input type="password" name="password" class="form-control" required>
        </div>
        <button type="submit" class="btn btn-primary">登录</button>
      </form>
    </div>
  </div>
</div>